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Ground Effect - Theory and Practice (1937)
NASA Technical Reports Server (NTRS) · leaf 37
H.A.C.A. Technical Memorandum No. 828 Pigs. 2,5,6,7,10,11 … Figure 5.- Lift of flat plate in proximity of the ground (partly approximated).NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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